debounce_pkg.vhd

   1 library ieee;
   2     use ieee.std_logic_1164.all;
   3     use ieee.numeric_std.all;
   4     use ieee.math_real.all;
   5
   6 package debounce_pkg  is
   7
   8 -------------------------------------------------------------------------
   9 -- Clock definitions
  10 -------------------------------------------------------------------------
  11     constant SYS_FREQ     : natural := 100_000;                     -- Clock freq. in kHz
  12     constant SYS_PERIOD   : natural := 1_000_000/SYS_FREQ;        -- In nanosec., 10 nsec for 100MHz clock
  13     constant DIV_DEB      : natural := 500_000/SYS_PERIOD;    -- Clock divider for 500us from 100MHz
  14     constant DIV_DEB_W    : natural := integer(ceil(log2(real(DIV_DEB+1))));
  15
  16
  17 -------------------------------------------------------------------------
  18 -- Size definitions
  19 -------------------------------------------------------------------------
  20     constant DEB_LEN            : natural := 32;
  21     constant DEB_LEN_W      : natural := integer(ceil(log2(real(DEB_LEN+1))));
  22     constant DEB_THRES_LO       : natural := DEB_LEN/10;
  23     constant DEB_THRES_HI       : natural := 9*DEB_LEN/10;
  24
  25 end debounce_pkg;
  26